fitting a porch light

[N3mo]

Hi all,

I want to install a light on my porch that can be switched on/off from inside. Question I have is where to source the Live from?

 

[PrenticeBoyofDerry]

You will require live/line, neutral and earth not just live/line.
The location of these would depend on how you installation was installed.
It could be that nearby light fitting has looped in cables or maybe a nearby switch plate has been looped in.
Don't be fooled by the colours of the cables, it is not unusual to come across core colours that you would associate with neutral conductors but there actually switch live/line.

Another option would be a fused spur from a socket.

 

[N3mo]

So I create a fused spur off a socket,

Can I then take a feed from fused spur to a switch and then from switch to light?

Or can I use a switched FCU?

 

[PrenticeBoyofDerry]

So I create a fused spur off a socket,

Can I then take a feed from fused spur to a switch and then from switch to light?

Or can I use a switched FCU?

You can do either but it is a requirement that any newly installed cable that is buried in a wall at a depth less than 50mm, will require either 30mA RCD protection or mechanical protection (metal capping is not deemed suitable as mechanical protection).
So the question would be do you have 30mA RCD protection on the circuit that you are taking a feed from, if not and cable is being buried, I would suggest using a 30mA RCD fused connection unit.